Bit-brace



(No Model.)

W. A. IVES.

BIT BRAG'E.

No. 301,058. mem-,Gamme 24, 1884.

WILLIAM A. IVES, OF NEV HAVEN, CONNECTICUT.

BITMBRC.

SPECIFICATION forming part of Letters Patent No. 301,058, dated June 214, 1884.

Application filed April 28, 1884. (No model.)

To all whom it may concern:

Be it known that I, WM. A.l Ivns, of New Haven, in the county of New Haven and State of Connecticut, have invented a new Improvement in litdraces; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description ofthe same, and which said drawings constitute part of this specification, and represent, in

Figure l, a side view of the body with the sleeve thereon; Fig. 2, a side view of the body and jaws, showing the sleeve in section; Fig. 3, a vertical section of the jaws and body 5 Fig. 4, a modification.

This invention relates to an improvement in that class of bit-braces which consist of a pair of jaws arranged in a socket upon which a surrounding-sleeve is provided, so as to be drawn onto the jaws by a corresponding screw-thread on the body ofthe brace,where by the jaws'are forced to engage the tang of the bit-a common and well-known class of bit-braces. As more generally constructed, these jaws are arranged loosely in the body of the brace, and a spring or other device provided to automatically ope-11 the jaws when relieved from the pressure of the surrounding sleeve.

The object of my invention is to make the jaws a fixed part of the body of the brace, and give to their tails sufficient elasticity to automatically open when relieved from the pressure of the sleeve; and the invention consists in constructing` the jaws with elastic tails made fast in or substantially a part of the solid body, combined with a surrounding sleeve screw-threaded, corresponding` to the screw-thread on the said body of the brace, as more fully hereinafter described.

A represents the body of the brace, to which the handle is fixed in the usual manner. It is cylindrical in shape, and screwthreaded upon its exterior, and upon this the sleeve B is fitted, as shown,- and as in the usual construction.

C C are two jaws, which I make from steel or other suitable metal having a degree of elasticity, and construct them each with a tail, D. The body A is cast upon the tails of the jaws, so as to be firmly united thereto,

as seen in Fig. 3. This is best accomplished V by forming a .mold corresponding to the body of the brace and the jaws, the two jaws then laid into the jaw part of the mold, their tails extending into the body portion. Then the metal poured into` that bodyportion of the mold will surround and unite with the tails of the jaws, so as to as firmly secure the parts together as if made in one and the same piece. This construction is very much cheaper than the jaws and body can be made'if forged complete from steel. The jaws and body A may be made complete in one and the same piece--say as cast from steel-and in which the jaws would be an integral part of the body. The jaws automatically open, owing to the elasticity of their tails, so that when free they stand in the position seen in Fig. 2. The interior of the sleeve is domeshaped, so as to bear upon the nose end of the jaws, and so that when the sleeve is run onto the body it will force the jaws together to grasp the bit-brace in the usual manner. The adjacent faces of the two jaws are recessed in the usual manner to form a seat for the tang of the bit. In some classes of braces the sleeve is arranged to operate upon the jaws in the opposite direction to that shown in Fig. 2-that is, as 'seen in Fig. 4. Such construction ne cessitates only a reverse incline to the backs of the jaws, as shown in that figure.

I claiml. The hereindescribed improvement in bit-braces, consisting of the solid cylindrical body A, screw-threaded upon its cylindrical surface, the jaws C C, with their elastic tails D D united to said body in the process of manufacture, whereby said jaws become substantially an integral part of the body, combined with a surrounding sleeve, B, internally screw-threaded, corresponding to the screw-thread on the body, substantially as described.

2. The jaws C, forged with their tails D D, and with the body A cast thereon, so as to imite with the tail ends of the jaws, substantially as described.

IVM. A. IVES.

W'itnesscs:

.,T. II. SrrUMwAY, Jos. C; Eliana. 

